Muffle furnace



Jan- 29, 1935- T.E. BRIDGFORD yMUFFLE FURNACE Filed Sept. 23, 1933 FIG.l

/N VEA/To( H Toe/VE KS Patented Jan. 29, 1935 v I s UNITED vsms/frsY I n...MUFFLE FURNACEp-- Thomas' Edward Bridgford,A Dudley, England, as-'signor to Gibbons Brothers Limited,` Dudley;

,n England, ya. company of Great Britainy :Application september23,1939, serial No." 690,741 l InwGreat-Britain September 27, 1932 YThisinvention relates to muille furnaces of hollow walls are-providedwithopenings ,10;so. the oven type wherein the oven` is'provided withthat yair from the-oven can enter the hollow-walls one or morelongitudinally .arranged combustion freely.A v. y .f l chambers Ahavingone or morev hollow., walls Near vthe top-the inner members --2 ,arepro- -i through which the. atmosphere ofthe oven can videdvwithintegralribs or projections-11 vwhich is circulate. J supportsealingtiles 12 and'furtherjsealing'tiles The object oflthepresent invention isto pro- 13,:of 'double ldovetail section may be lemployed Vide i 'animproved construction fof. combustion so asfto constituteal second seal.z chamber for use in such furnaces. f The base 14 of the improvedcombustion chaml'a f` Referring ,to the drawing: v beris formed'as aksinglenmember,-=:but may be 10,`

`vfFig'ure 1 is ai View insectional end kelevation built. upfrom.avvplurality of members, andgit" is showing the general arrangementofatmufiiefur; providedvwith-openings 15 to allowofyaircirculanace'oven'containing two ofthe improved. conition..A y i I.19; n r l, bustion chambers. y Further, the base 14 issupporte'd uponspaced 15 -Figure 2 is'e'section'al view taken through one bricks16..the spaces between the bricks `correl5 ofV theehembers, lspondingmiththegopenings-l 'and the. openings Figure 3 is a vsideView-0i` vthi-yehamber, through thewblcks` 6 S0; .that ail'. can.circulate -Figurefi a sectional viewton 1ine 4 4 of freelythroughthe.hollow walls` and'valso under Figure 2. f thebase. v v- 1 theconstruction illustrated, the'invention .l The-bricksand.theclosure-.members 8 are 20. is Shown as .applied to 19, munie furnacehaving made of arefractory materialsuch as-re clay. two Combustionehajmberr,A 1A arranged oneat The:J iioor of the :furnaceAVis..pr'ovided `iwith either side of the'ovenormuiile chamber. f. fspaced hollowribs Vil-'Landlthe products of comshape in cross-sectionaslshown iii-Figure zfalnd' chambers 1 are directed t0thesexhollowribs'by .25 its inclined sides are hollow or formedfwthlcav'- ueS 18, SQ` thatl the :said combuStiOIl products itiesh f u .canbe used ltoxheat upithe floor of fthefurnace.

l. The `inner Wan 2 of eaeh'fef these' Sides. is Th'esehollow ribs 1-7are `not howeverpessential formed of'members-extendingfrom top to4botandfth'efimprOVed r COIlll'IvllStOIrClflallbel' iSv ap* tom, but maybeformed in a-plurality of zpieces, plicablexzgenerally to muiile ovens;theqproducts 3Q and these members .2. maybe `made of e, highly of:combustion .passing,for example, fromthe end refractory materiel'suehas silicon carbide; Tof-the combustion chambers tothe ychimney or LThemembers 2 are 'provided with integral ribs eXhauStylle- Y LV f5 3arrangedin spaced relationship upon their outer :What I Claim then iSifi lf Sides- 1 o 1.Amuillerfurnaceof-.thevovenxtype having a 35 Themembers `2 ere. provided with projecting combustion chamber at theyside;v of .the oven and hollow ribs 4 at opposite edges whichinteren'gage 'eXGIldIlg10I1gi11d11a11yheI'eOffSpaCdinnel'and withsimilar ribs upon the adjacentmembers as youter 'wallsl forming a hollowSide wfsaid wmf f Shown vClearly .m Figure vrend the errengenmnrlkbustionf'charnbenithe `atmosphere of 'the oven 40 -mayube such that aircan circulatethrough the beineadapted Ito 'circulate throughsaid=-ho11ow 40 Openings 5 'm .theprojeerions 1 l f l 'sidet-ptheouterwall of saidv hollow side, in Contact The enfer Wel-lef eeen'V ofthezhouow sides is iwiththeroxidizing atmosphere of theoven, being e,built upef anumberof ehannersectien .bricks 4formed fromAnon-oxidizingrefractory material, egtnese 'bricks extending. in betweenthe :ribs 3 andztheinner wall of said hollow side, in contactan-*dihaving projecting-shoulders 7 Whihengage wth'the Combustion-gases;beingfoimedfrm 45 each other i y t highly refractory materialiand.insertsfof .non-"f -,Separatelyconstructed inserts or closure niem-Oxidizng vmfllwtorf rnflali"tv them-utep S111- bersvs'are provided,thesemembers being shoulface vof Sadinnerf Wallto Shield Said Surfacedered ase'shown at 9 and being employedffor "from thepxdzng atmosphereoftheovenf ,f

L closing theopen sides of the channel 6. l 14mm@ furnace'foflhe OVBHWDhangab 50 5 These members 8 mayibeprovided Varios combustionAchamber*falongffeach` longitudinal side thicknesses so .that the heatcenduetirn-,ynfgghe ofthe oven,V each side.ofeachcombustionchamber erwallof the combustion chamber as "a whole -bllg'lhQllOW t0 BIOWCirculation thelthrollgh 1 canbe varied as desiredl y "j Y Ctheyatxiiosphere*ofv theoven; spaced innerand e The members atthe topsand bottoms of the 'outer-"walls forming each ofsaid sides. the-'outer55 3. A muiile furnace of the oven type havinga` combustion chamber atthe side: of the oven and extending longitudinally thereof, eachsidefuif/said'-4 combustion chamber being .hollow -toallow circu-ylation therethrough of thef,atirispliere ofl'tlie oven, an inner wallfor each sidesp a ced ribs projecting from the outer surface of saidwall, an outer wall spaced from-saidiiine'rwallfbyesaidff ribs, theouter wall of each side; in contact-with the oxidizing atmosphere of theoven, ,-:]:iefing formed from non-oxidizing refractory material,

andJthe-finneri-walllof each side,l in contact 'with the' 'combustiongaseatbeing formed froma highly refractory material and insertsofnon-oxidizing refractoryz'materialattheiouter-surface of said inner`wallito' shield the portionsof thelinner wall exposedlfto-th'ev'oxi'dizingv atmosphere of. the roven. flhA-munie furnaceofithesoven type having-a combustion chamber ati the lside oftheoven'iand extendingllong'itudinally thereof, each sideof saidcombustionfchamber being hollow toallow circulatinrtherethroughf of,`the atmosphere ofi `the oven; I larrii innen` :wallf'fox'f eachl iside,spaced ribs projecting from the outer surface of said wall, anouteriiwall, said vfouten` wall-l being built. up l-from channel.'section .1 briclrs:engaging between, the spacedribsorrsaid inner Iwall,a' clsuremember fortheinnen side of each: of said. channel sectionbricksys'aid; closure.` mexr'ibercwbeing.l interposed between said brickand the outer surface of: said inner wallrthenutervwalr'of eachside,vin\contact with the oxidizingfatmosphere ofi the oven, beingformed. from" non-oxidizing -Lrefractory material, andithe inner-..wallf. of eachiside,v invcontactV with thecox'nbustion: gases-',:beingformed `from ahighly refractory.'rnaterialt ...572 i ffii @5L-:Anime.furnace {o'frfth'e ovenr type having a combustion chamber alongeachslongitudinal side fof;.'thezzoven`,I .each side ofteach .combustionchainber being-hollow to'allow circulation' therethroughlofi...theaatmosphereI ofV the o'venan.inner=` Awall fon each.; side,ispaced .ribsf projecting from1 vthe outenxsurfaceof 1 saidlwallr an.outen vwall spaced from said inner wall by said ribs, said-louter. wallbeing built up from channel sectionz bricksengagingrbetween;y ther:spaced. ribson: .said inner walhthe outeitiwallfofze'ach side', .incontact: with the .oxidizingzfatmosphere: ofiffthe .oven,.; beingformedifrom non-oxidizing refractoryl material, anch theainnen wall .ofeach. side, inf contact.` with thecombustion Jgas'e`s,.-l;`eingformed-fiona highly refractory .materialaand inserts. of r:non-oxidizingref-i'xaictory.v material :at thev outer.`r surface of said Ainner mall..tofshield the portions -of the inner .wall exposedrtothe; oxidizing?atmosphere; of the'zoven.

563A muflleffurnace.: of :the ovenztype-having -alxcoxnbustionzfchamben.at the side of the; oven -an'd extending longitudinally;thereof, a.baseVV for f'sxidzscombustion., chamber, two. sides.. extendingupwardlyi from. said-baselin 1. converging relationv ship, fsealing L'tiles filling the. -joint .at theeupper ren'dss cf;.-sai'd`sides,ieachisidelof ysaid combustion 'chamberbeingehollowz'toallow'fcirculatioir there- ..thrnughflofzthe atniosphlere,y ofitheovenspaced innrfand outer :wallseiformingieach.ofesaidfsdes berm-.lienof @9.1.1 side, iniszenta't. Witlitbe oxidizing atmosphere of the oven,being formed from non-oxidizing refractory material, and the inner wallof each side, in contact with the combustion gases, being formed from ahighly refactory material and inserts of non-oxidizing refractorymaterial at the outer surface of said inner wallito shield .the portionsof.the.inner wall exposed to lthe oxidizing. atmosphere :of` the oven.

'7. A muiiie furnace of the'oven type having a combustion chamber alongeach longitudinal side yf the oven, a base for each combustion chamber,

two. sidesi extending upwardly from said basein converging relationship,sealing tiles filling the ijoi'n't't the'upper'-ends of said sides, eachside of eaichcoinbustion chamber being hollow to allow circulationtherethrough of the atmosphere of the ovenijifan-:inner wallv for eachside, spaced ribs lprojecting"frmg the outer surface of said wall,

aneouterwall spaced from said inner wall by said ribs, the outer wall ofeach side, in contact with theer 'oxidizing'atmosphere '.of .the oven,.being formedrfrom.I non-oxidizing' refractory material, andithe.`inner. .wallzof .eachgside, ini contactcwith the y.combustion gases,being. formed .fromfaV highfM lys refractory material .and inserts .ofivnone-oxidizing refractory material at the outer surfaces-of said innerwall. tofshield the; pcrtions vofi the; inner wall exposedlto the-.oxidizing atmosphere. Aof Athe oven. J

8. A munie furnacefofI the-oven.type.having a combustionfchambenalongeach longitudinalzside ofthe -ovengda .base foreachzcombustionchamber,spaced..bricks between said base andtheloor, of the oven to allow theoven atmosphereg-to-circue late ,beneath .said base, two.- sidesdexi-,endingfupwardly from said base in converging: relationship,sealing.tilesifilliriggthe :jLointuat thezupper endsof saidsides,;each:side.of each combustion chamber being hollow to allowcirculation 'theref-v throughof the atmosphere. lof 4',thefoven, an'.inner walLfor each side, ,spaced rbszplojecting fromethe outerv fsurface. of; said: wa1l.;.- andan: outer. wall spaced ,from4 .saidinner..- wallffby. 'saidf ribs, e: Said outcry-wall being built;,upfromichannel ,section bricks ,engaging between the/spaced-ribs-onisaid l l. 2.I 9. A muiiie furnace of the oven type havin'a 'combustion chamberalongeachjlongitudinalgside ofthe ioven, afbasefor=.ea.ehi combustionchamber,

lspaced' bricksqbetween said. base: andg the iioor rof Athe oyentofallowgthe. oven atmospherefto Icinculatef beneath., `said base,v `twosides extending upwardly-j froml saidrbaserini converging.:relationship, sealing tiles'llingsthe. joint at,; thupper ends of saidsides, each side of each combustion chamber` being,-liollow toallowfcirculation therethroughof: the :atmosphere: of the` oven, aninner Walurrah sidefspaced rzibsroiebing .fromzthe outer surface. ofsaid wall, anbutergwall spaced outer surface of said inner wall.

10. A Irnuiiie. furnace@ of the oven .typefhavirig `a combustionchamber.along each longitudinalrside oftheoven .a basefor each combustionchamber,

two' sides extending upwardly yfronrsaici base; in pnverging;relationship,h sealing tiles llingfrthe intiaf." 'the upper ends 0f.Sad-Sides, each .Side-0f leach, corrilmstion4 chamberl'being. hollow, to,allow circulation'tlierethrough of thefatnosphere ofgltiie the innersurface of each inner wall to support said sealing tiles, spaced ribsprojecting from the outer surface of said wall, an outer wall spacedfrom said inner wall by said ribs, said outer wall being built up fromchannel section bricks engaging between the spaced ribs on said innerwall, and a closure member for the inner side of each of said channelsection bricks, said closure member being interposed between said brickand the outer surface of said inner wall. l

11. A muilie furnace of the oven type having a combustion chamber at theside of the oven and extending longitudinally thereof, a base for saidcombustion chamber, two sides extending upwardly from said base inconverging. relationship, sealing tiles filling the joint at the upperends of said sides, each side of said combustion chamber being hollow toallow circulation therethrough of the atmosphere of the oven, an innerWall for each side, said inner wall being built up from slabs,interengaging hollow ribs at the meeting edges of adjacent slabs, spacedribs projecting from the outer surface of said wall, an outer wall, saidouter wall being built up from channel section bricks engaging betweenthe spaced ribs on said inner wall, and a closure member for the innerside of each of said channel section bricks,

said closure member being interposed between sealing tiles lling thejoint at the upper ends of' said sides, each side of each combustionchamber being yhollow to allow circulation therethrough of theatmosphere of the oven, an inner Wall for each side, said'inner wallbeing built up from slabs, interengaging hollow ribs at the meetingedges of adjacent slabs, spaced ribs projecting from the outer surfaceof said wall, an outer Wall,

said outer wall being built up from channel section bricks engagingbetween the spaced ribs ony said inner wall, and a closure member forthe inner side of each of said channel section bricks, said closuremember being interposed between said brick and the outer surface of saidinner Wall. f

THOMAS EDWARD BRIDGFORD.

